123401520111 has 16 divisors (see below), whose sum is σ = 167011000704. Its totient is φ = 81030152544.

The previous prime is 123401520097. The next prime is 123401520119. The reversal of 123401520111 is 111025104321.

It is not a de Polignac number, because 123401520111 - 2¹¹ = 123401518063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123401520119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1913356 + ... + 1976798.

It is an arithmetic number, because the mean of its divisors is an integer number (10438187544).

Almost surely, 2^123401520111 is an apocalyptic number.

123401520111 is a deficient number, since it is larger than the sum of its proper divisors (43609480593).

123401520111 is an equidigital number, since it uses as much as digits as its factorization.

123401520111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73190.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 123401520111 its reverse (111025104321), we get a palindrome (234426624432).

The spelling of 123401520111 in words is "one hundred twenty-three billion, four hundred one million, five hundred twenty thousand, one hundred eleven".